If NO taxi light is installed, use is the the same as the taxi light during the day

id like to know when do commercial airlines normally turn on the landing light & taxi light? and when do they turn them on? and do they use them in the daytime or nightime or both? and what are they basically used for?

here are the rules for lights.

landing Light: DAYTIME: If NO Taxi Light is installed, use is the the same as the taxi light during the day.

NIGHTIME: OFF leaving the runway after arrival. If NO taxi light is installed use as a taxi light during night.

Taxi Light: DAYTIME: ON taxing onto the active runway for departure.

OFF when no longer required to enhance "See and be seen"

ON approaching the airport

OFF leaving the runway after arrival

NIGHTIME: ON during taxi as needed during departure and arrival. OFF when the landing light is turned on.

Hope this answers your question.